Adoptees who reached out to family first how did it go?

I am in the very early stages of reunion with my paternal first family. I have spoken with my brother & a cousin but haven’t heard back from my sister & want to reach out to more aunts, uncles & cousins. I’m hesitating because I am unsure if my sister knows about me. Has anyone reached out to extended family that likely didn’t know about you & how did it go?